End wrench



April 28, 1931. P L 1,802,832

END WRENCH Filed March 18, 1930 Patented Apr. 28, 1931 UNITED STATESARTHUR PRIDDLE, OF SAN FRANCISCO, CALIFORNIA END WRENCH Applicationfiled. March 18, 1930. Serial No. 436,799.

The invention aims to provide an end wrench having an improved jawconstruction providing a substantially parabolic notch between theopposed jaws and hence adapting the latter for gripping nuts of varioussizes,

whether square or hexagonal.

With the foregoing in view, the invention resides in the novel subjectmatter hereinafter described and claimed, description being supplementedby the accompanying drawing.

Fig. 1 is a perspective view of an end wrench constructed in accordancewith my invention, having its jaws oblique to the 16 wrench handle.

Fig. 2 is a side elevation of a wrench whose jaws extend longitudinallyof the handle.

Figs. 3, 4, 5, 6, 7 and 8 are fragmentary side elevations showing themanner in which the jaws will grip nuts of various sizes, whether squareor hexagonal.

The construction and relation of jaws is the same at either end of thewrench handle 10 in either Fig. 1 or Fig. 2, there being however adifference in size and spacing to allow the jaws at one end of thewrench to handle nuts of larger sizes than the jaws at the other end,and the only differences between the wrenches of Figs. 1 and 2, arematters of size and angular relation of the jaws with the handle 10.Hence, a description of one set of jaws and their relation to eachother, with the reference characters applied to all of the jaws, willsufiice. Moreover, it may be pointed out that while the invention isshown in connection with a wrench having jaws at both ends, it isequally well adaptablev to one having jaws at only one end.

The two jaws are denoted at 11 and 12, the

inner edges of said jaws being straight and parallel as at 13, fromtheir front ends to the line 14:. Behind this line, the jaw edges arelongitudinally curved as at 15 and said edges converge rearwardly. Thisconstruction provides a substantially parabolic notch 16 which isadapted to receive nuts of a plurality of different sizes as will beclear from Figs. 3 to 8, whether said nuts be of square or hexagonalform, said notch 16 being of a length substantially twice the greatestwidth of said notch, although strictly speaking, the length of the notch16 is only about one and three-quarters times the distance between thefront ends of the jaws 11 and 12. The length of the straight faces 13 ispreferably about three-quarters of the distance between said faces.

The construction shown and described will effectively handle nuts ofvarious sizes and will tenaciously grip the nut regardless of its sizeor shape. It is hence possible to provide a set of wrenches consistingonly of a relatively few of the latter, yet capable of handling anunusually large number of nut sizes.

The parabolic notch gives instant fitting of the wrench to the nut andupon turning of the wrench in either direction, the curved edges of thejaws will positively grip'the nut at three points, providing a camaction in "To effecting the nut-holding operation. It is unnecessary toprovide any nut-holding means other than the parabolic shape hereindescribed, and even though the sides of the slot 7 and the sides of thenut be highly polished, 75 the nut will be tenaciously gripped withoutslippage. The improved wrench will handle nuts of all standard shapes,for instance, square, hexagonal, pentagonal, etc., and on one size nut,the parallel front ends of the jaws may be used in the conventionalmanner, contacting with opposed faces of the nut.

I claim 1. An end wrench having the inner edges of its jawslongitudinally curved and disposed in rearwardly converging relation,providing a substantially parabolic notch adapted to receive nuts ofvarious sizes, the length of said notch being substantially twice itsgreatest width. 7 I 99 2. An end wrench having the inner edges of itsjaws disposed in parallel relation at their front portions, said edgesbeing longitudinally curved behind their parallel portions andoonverging'rearwardly, providing a substantially parabolic notch adaptedto receive nuts of various sizes, the length of said notch beingsubstantially tWice its greatest Width. 7 V

In testimony whereof I have hereunto affixed my signature.

ARTHUR PRIDDLE.

